The diagram below shows how electricity is generated in a hydroelectric power station. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

The flow chart explains the process through which the water is used to produce electricity in a hydroelectric station.

According to

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the diagram,

firstly

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, the river water flows to the high-level reservoir surrounded by a dam and faces a mechanism, which is opened during the daytime and closed at night. In the subsequent stage, to generate electricity, it goes through the pile downwards to the power station, which, to be more precise, consists of several parts including a generator, power lines and reversible turbines. In the next stage, during the day fluid passes through

this

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system and

finally

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appears in the low-level reservoir with the help of reversible turbines, which operate the generator.

However

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, at night the mechanism works in the opposite direction, in fact, the fluid is pumped into the high-level reservoir from the lower one.

Overall

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, it is evident from the graph that the process is cyclical and consists of 4 main stages: storing water high, letting it downwards, preserving it low and pumping it up.